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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c876e41f95ed3a3f7573f3f3679faa57fc686f75770eca7627be4bdccc24828e' 
  AND token = 'AyqcQ1375eOr/vXVApjT3eOhge4w/Epi3LuIP2ve5JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}